Paper-cutting machine



Patented duly 2.9, 1924.

ses;

HORACE s. WILLIAMS, or BnooKLYN, NEW YfoRK.

Applica'ton led December 5, v1922. Serial No. 605,069.

To a-ZZ whom t may concern.'

Be it known that I, Hormon S. "WILLIAMS,

a citizen of the United Sta-tes, and a resi-.5'

dent of the city of N ew York, borough of Brooklyn, in the county of Kingsand State of New York, have invented new and uselful Improvements in Paper-Cutting Machines, of which thefollowing 1s: a full,-

clear, and exact description.

The present invention relates to papercutting machines and it pertains more par-V. ticularly to a new and improved method of knives are awkward'to handle owing to theirv extreme weight and length.

It is one of the objects ofthe invention to construct the clamp of the machine so thatv it may be utilized to raise and lower the knife to position where it may be secured to or removed from the knife bar.

Paper-cutting machinesV as commonly constructed have a clamping element which serves to retain the stack of paper being cut in position upon the bed against shifting movement owing to the cuttingaction of the knife;v This clamping member is moved vertically by means of a foot treadle and raised and lowered upon operation of such foot treadle.

lVith the above and other objects inview, referenceis had to the accompanying -drawings, in which- Figure 1 'is a detail front elevation of a paper-cutting machine showing the back guide and the knife bar; p A

Fig. 2 is a detail sectional'view takenk on the line 2-2 of Fig. 1;

Fig. 3 is a similar view showing one of the means for securing the knife to the knife bar removed and the knife attachedto the clamp; l

Fig. 1 shows the clamp in lowered position and removing the knife therefrom;

Fig. 5 is a view in elevation of one of the tools employed for removing the knife.

Fig. 6 is a detail plan view of the free end of the tool shown in Fig. 5, and

Fig. 7 vis'a detail'perspective view of the means employed for securing the knife to the clamp.

Referring more particularly to the drawings, the reference character 10 designates the knife bar, 11 they knife, 12 the means for securing the knifeI to the knife bar 10, 13 the vertically moving clamp, 14 the bed of the machine, and 15 the cutting strip.

In carrying out the present invention, the clamp 13 is provided with 'recesses 16, or the like, and said recesses are so positioned with respect to the clamp that when the knife bar 10 and the clamp 13 arel in their uppermost position, the recesses 16 will be behind certain of the fastenings which secure the knife to the knife bar as shown in Fig. 2.

It has been found-by act-ual experience that it is only necessary to provide the clamp 13 with two recesses 16, there being one adjacent each end ofthe clamp, but I do not wish to be limited to`any specific number of recesses 16 since one or more may be employed as desired.-

vIn carrying out the invention the knife bar 10 and the clamp 13 are raised toI their uppermost position, and asheretofore stated when these two elements are in this uppermost position, the recesses 16 in the clamp 13 are positioned behind their vrespective fastenings of the knife to the knife bar.

Vith the parts in this position, the fastenings in front or opposite4 to the recesses 16 are removed and a vsuitable(fastening is passed through the fastening opening of the knife bar into engagement with the knife andV having its free end pro-jectino into its respective recess in the clamp 13. Referring to Fig. 7, it will be noted that the fastening element comprises a tubular member having an enlarged diameter 20 and a reduced diameter 21'. The enlarged diameter 2O is a screwthreaded as shown at 22, and provided with .a kerf 23 for the engagement of a tool, by

means of which the fastening may be rotated. The tool 30 as shown in Figs. 5 and v6, consists of a body portion or shank 30 having a curved end 31 to facilitate gripping of the tool.

vtool is provided with a reduced portion 32,

The opposite end'of the at the base of which is formed a flange 33,

which flange is of a size to permit of its being introduced into the kerf 23 of the fastening heretofore mentioned.

After the fastenings which secure the knife 11 to the clamp 13 have been positioned.

those fastenings which secure the knife to the knife bar 10are removed, and when the last-mentioned fastenings have been removed it is apparent that upon lowering the Clamp 13, the knifell will be carried downwardly therewith, it being understood, of course, that the tool 30 at each side of the machine is removed before the lowering operation of the clamp takes place. After the clamp has been lowered, the tools `30 are again inserted as shown in Fig. 4t, and the knife ll may be removed from the clamp 13 and completely removed from the machine. Y

W'hile the forego-ing describes the operation by which a knife is removed, it is obvious that if the clamp 13 is lowered and the knife attached by means of the special fastenings and the tool 30, when the clamp 13 is raised the knife will be moved to proper position relative to the knife bar l() and the Vfastenings l2 heretofore mentioned may be positioned to secure said knife to the knife bar, after which the special fastenings arek such operation is carried out the knife bar may be readily removed or replaced in the machine without danger on the part of the operator.

lVhat is claimed is:

l. In a paper cutting machine, a knife, a knife bar to which the knife is adapted to be attached, a vertically movable clamp having recesses, means for securing the knife temporarily to said clamp to move the knife to position to be secured to the knife bar, and means for securing said knife to said knife bar.

2. In a paper cutting machine, a knife, a knife bar normally occupying an elevated position, a clamp having vertical movement and provided with a plurality of recesses, means for engagement with the recesses in the clamp for temporarily securing the knife thereto to permit of it being elevated to the position of the knife bar, and means for se curing the knife to the knife bar.

3. In a paper cutting machine, a knife, a knife bar, a-clamp, a plurality of recesses formed therein, means adapted to pass through the knife and into engagement with the recesses in the clamp to temporarily secure the knife to the clamp, whereby the knife may be moved by the clamp to position adjacent the knife bar, and means for securing said knife to said knife bar.

4. The method of attaching knives to the knife bar of paper-cutting machines, which consists in temporarily securing the knife to the clamping bar of said machine, elevating the knife to the knife bar through the medium of the clamping bar, securing the knife tothe knife bar, and removing the temporary fastening of the knife to the clamping bar.

5. In a paper-cutting machine, a reciproeating paper clamp, a reciprocating knife bar, a knife, said paper clamp and said knife having means to temporarily receive a fastener for attaching the knife to the clamp for raising the knife to the posit-ion of the knife bar, and means for securing the knife to the knife bar.

6. In a paper-cutting machine including a reciprocating paper clamp, a reciprocating knife bar, a knife, means independent of said knife bar to temporarily attach the knife to the clamp to cause the knife to be lifted to the knife bar in emplacing the knife, and means for securing the knife to the knife bar.

' 7. In a paper-cutting machine and in combination, a knife, a knife bar, means for securing said knife to the knife bar, and a clamp having a plurality of recesses therein, and means comprising a screw-threaded member having threaded engagement with the knife and extending into the recesses in the clamp to temporarily fasten the knife tothe clamp. Y

HORACE S. I/VILLIAMS. 

